Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f70f5ed79388ad…

MALICIOUS

PDF

68.8 KB Created: 2021-09-28 05:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6bfb03a698f69c66efcc61c31c8966f9 SHA-1: 0c8d3803257cfe3406a78f9ddd72dfe560f5075e SHA-256: a8f70f5ed79388ada0e2889067db130ffbc6b1f958cf36032a5f73bdbedab926
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, directing users to download PDF files. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing malicious software disguised as a browser update or extension.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=chrome+uninstall+android PDF link annotation
    • http://mesterteto.hu/userfiles/file/19609405811.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210911044330.pdfIn PDF document text
    • http://clingac.com/d/files/24980921667.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/vefodupufipe.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/xoviberedegugofiko.pdfIn PDF document text
    • http://sun-eko.eu/files/file/97294215651.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/12826301591.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/87216938166.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/8a2dabc5807208c1e92739626609c8c2/lovanun.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/90211934057.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/99026187731.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/fitigalimiroribopaved.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/77437473212.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109121910393953.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/melaxadiveke.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/51911886768.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/48248730086.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/26150133775.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210926104418128732847.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/8005632825.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/xorigukufimajimixeles.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/xibotitofazikujomewogija.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ade8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FF 10644 bytes
SHA-256: 3fe500c4d10bbf266bace2be33c8fe6da991b93220a6155b455baff91d8b27aa
font_02_sfnt_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 15536 bytes
SHA-256: cc1b9b1a40bf997d6baa656ed6ca2f159b1b09ee059966a776c9a17f11f1796e

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